If the problem persists creates another user, for example toto:
sudo adduser toto
Run your graphical session in toto and tell me if the problem persists. If emesene begins to run is probably your current emesene account is flawed and must be deleted to recreate its own (which will force you to reconfigure emesene).
I think this is the directory ~ /. Emesene (ie / home / mando / .emesene if your login is mando). To transfer:
rm-rf ~ /. emesene
Alternatively, use another client msn, pidgin for example, empathy, mercury or kopete.